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EXTRACT [/Y] [/A] [/D | /E] [/L dir] cabinet [filename ...]
EXTRACT [/Y] source [newname]
EXTRACT [/Y] /C source destination


  cabinet  - Cabinet file (contains two or more files).
  filename - Name of the file to extract from the cabinet.
             Wild cards and multiple filenames (separated by
             blanks) may be used.


  source   - Compressed file (a cabinet with only one file).
  newname  - New filename to give the extracted file.
             If not supplied, the original name is used.


  /A         Process ALL cabinets.  Follows cabinet chain
             starting in first cabinet mentioned.
  /C         Copy source file to destination (to copy from DMF disks).
  /D         Display cabinet directory (use with filename to avoid extract).
  /E         Extract (use instead of *.* to extract all files).
  /L dir     Location to place extracted files (default is current directory).
  /Y         Do not prompt before overwriting an existing file.

Note that if the .CAB file contains only one file, you can extract and rename in one operation:
EXTRACT commpressed.cab start.bat
this also appears to work with the 32bit version of EXTRACT:
EXTRAC32 compressed.cab start.bat